Box spring corner piece



FIG. 1 is a perspective view of a box spring corner piece showing my design;

FIG. 2 is a perspective view of the box spring corner piece of FIG. 1;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view thereof, the opposite side view of which is a mirror image thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

In the drawings, the broken line showing of a box spring depicts environmental subject matter and forms no part of the claim. 

The ornamental design for a box spring corner piece, as shown and described. 